LM5072

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SNVS437D – MARCH 2006 – REVISED APRIL 2013

LM5072 Integrated 100V Power Over Ethernet PD Interface and PWM Controller with Aux

Support

Check for Samples: LM5072

1

FEATURES

DESCRIPTION

The LM5072 Powered Device (PD) interface and

2

•

PD Interface

Pulse-Width-Modulation (PWM) controller provides a

–

Fully Compliant IEEE 802.3af PD Interface

complete power solution, fully compliant to IEEE

–

Versatile Auxiliary Power Options

802.3af, for the PD connecting into Power over

Ethernet (PoE) networks. This controller integrates all

–

9V Minimum Auxiliary Power Operating

functions necessary to implement both a PD powered

Range

interface and DC-DC converter with a minimum

–

100V Maximum Input Voltage Rating

number

of

external

components.

The

LM5072

–

Programmable DC Current Limit Up To

provides the flexibility for the PD to also accept power

800mA

from auxiliary sources such as AC adapters in a

variety of configurations. The low RDS(ON) PD

–

100V, 0.7

Ω Hot Swap MOSFET

interface hot swap MOSFET and programmable DC

–

Integrated PD Signature Resistor

current limit extend the range of LM5072 applications

–

Integrated PoE Input UVLO

up to twice the power level of 802.3af compliant PD

devices. The 100V maximum voltage rating simplifies

–

Programmable Inrush Current Limit

selection of the transient voltage suppressor that

–

PD Classification Capability

protects the PD from network transients. The LM5072

–

Power Good Indicator

includes

an

easy-to-use

PWM

controller

that

facilitates the various single-ended power supply

–

Thermal Shutdown Protection

topologies including the flyback, forward and buck.

•

PWM Controller

The PWM control scheme is based on peak current

–

Current Mode PWM Controller

mode control, which provides inherent advantages

including line feed-forward, cycle-by-cycle current

–

100V Start-Up Regulator

limit, and simplified feedback loop compensation.

–

Error Amplifier with 2% Voltage Reference

Two versions of the LM5072 provide either an 80%

–

Supports Isolated and Non-Isolated

maximum duty cycle (-80 suffix), or a 50% maximum

Applications

duty cycle (-50 suffix).

–

Programmable Oscillator Frequency

PACKAGES

–

Programmable Soft-Start

•

TSSOP-16 EP (Exposed Pad)

–

800 mA Peak Gate Driver

–

80% Maximum Duty Cycle with Built-in

Slope Compensation (-80 Device)

–

50% Maximum Duty Cycle, No Slope

Compensation (-50 Device)

APPLICATIONS

•

IEEE 802.3af Compliant PoE Powered Devices

•

Non-Compliant, Application Specific Devices

•

Higher Power Ethernet Powered Devices

1

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2

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PRODUCTION DATA information is current as of publication date.

Copyright © 2006–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.